Justification:
Although specimens have been collected from a number of locations in south-east Asia, the abundance of Taenaris horsfieldii is uncertain, with some reports stating that it is rare (D'Abrera 2001, D. Peggie pers. comm. 2008). However, it is sufficiently widespread to qualify as a species of Least Concern, particularly since it is currently not affected by any major known threats.

This forest butterfly occurs in peninsula Malaysia, Indonesia (Java), the Philippines (Palawan) and Borneo, giving an extent of occurrence (EOO) well in excess of the 20,000km2 threshold for threatened status. Additionally, as it is a species of both primary and secondary forest its area of occupancy (AOO) is likely to be well above the threshold 2,000 km2 for threatened species.

This butterfly inhabits primary and secondary rainforest. Adults favour deeply wooded areas but may also be seen sometimes flying slowly but directly across open areas, usually high above the ground. Males may establish small territories in clearings, which they defend weakly from perches from 2 – 8m above the ground.